Laserfiche WebLink
' Tank Removal <br /> • A 500-gallon fuel UST was removed from Former Tank Site #2 in August <br /> t1991 (Figure 1-2) Visual observations during removal indicated that the <br /> tank was severely corroded and contained several holes Analysis of soil <br />' and ground water samples collected from the tank excavation indicated <br /> that gasoline and gasoline components were present in site soils <br />' Site Characterization <br />' ERM drilled and sampled four soil borings and constructed monitoring <br /> wells within these borings at Former Tank Site #2 during a Phase I <br /> investigation conducted in March 1992 Well locations are presented on <br />' Figure 1-2 These characterization activities and the extent of hydrocarbon <br /> release to soil were summarized in the PAR <br />' The site investigation indicated that the lateral extent of TPH and BTEX in <br /> soil was limited to the area immediately northeast of the former tank <br /> location, and that the vertical extent was primarily limited to a zone <br />' ranging from approximately 5 to 8 feet bgs The volume of soils <br /> containing TPH as gasoline in excess of the 100 mg/kg cleanup goal for <br /> TPH was estimated to be approximately 500 to 700 cubic yards <br /> 1� <br /> The extent of TPH and BTEX in ground water at Former Tank Site #2 <br /> appeared to be limited to a Iocalized area surrounding monitoring well <br /> MW-1A, located immediately north of the former tank location <br />' Excavation <br /> Soil excavation activities at Former Tank Site #2 were conducted in <br />' October 1993 concurrently with the Former Tank Site #1 excavation work <br /> Excavation and confirmation sampling activities were summarized in a <br />' letter report submitted to PHS/EHD on 2 March 1994 <br /> The excavation at Former Tank Site #2 extended to a depth of <br /> approximately 8 to 9 feet with areal dimensions of 115 feet in length and <br />' 40 feet in width (including side slope dimensions) For excavation near <br /> the building, the excavation was sloped at a minimum 11 slope to avoid <br />' undermining the building structure Ground water seepage was <br /> encountered at excavation depths below 7 feet Further soil excavation <br /> and confirmation sampling below this depth required dewatering of the <br />' excavation using a vacuum truck Soil excavation activities proceeded <br /> • until mobile laboratory analytical results indicated that the cleanup goal <br /> I <br /> 3-6 <br /> I <br />